* Build udhcpc binary from source.

[grml-terminalserver.git] / udhcp / dumpleases.c

diff --git a/udhcp/dumpleases.c b/udhcp/dumpleases.c
new file mode 100644 (file)
index 0000000..a9036df
--- /dev/null
+++ b/udhcp/dumpleases.c
@@ -0,0 +1,110 @@
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <time.h>
+
+#include "dhcpd.h"
+#include "leases.h"
+#include "libbb_udhcp.h"
+
+#define REMAINING 0
+#define ABSOLUTE 1
+
+
+#ifndef IN_BUSYBOX
+static void __attribute__ ((noreturn)) show_usage(void)
+{
+       printf(
+"Usage: dumpleases -f <file> -[r|a]\n\n"
+"  -f, --file=FILENAME             Leases file to load\n"
+"  -r, --remaining                 Interepret lease times as time remaing\n"
+"  -a, --absolute                  Interepret lease times as expire time\n");
+       exit(0);
+}
+#else
+#define show_usage bb_show_usage
+#endif
+
+
+#ifdef IN_BUSYBOX
+int dumpleases_main(int argc, char *argv[])
+#else
+int main(int argc, char *argv[])
+#endif
+{
+       FILE *fp;
+       int i, c, mode = REMAINING;
+       long expires;
+       const char *file = LEASES_FILE;
+       struct dhcpOfferedAddr lease;
+       struct in_addr addr;
+
+       static const struct option options[] = {
+               {"absolute", 0, 0, 'a'},
+               {"remaining", 0, 0, 'r'},
+               {"file", 1, 0, 'f'},
+               {0, 0, 0, 0}
+       };
+
+       while (1) {
+               int option_index = 0;
+               c = getopt_long(argc, argv, "arf:", options, &option_index);
+               if (c == -1) break;
+
+               switch (c) {
+               case 'a': mode = ABSOLUTE; break;
+               case 'r': mode = REMAINING; break;
+               case 'f':
+                       file = optarg;
+                       break;
+               default:
+                       show_usage();
+               }
+       }
+
+       fp = xfopen(file, "r");
+
+       printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
+       /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
+       while (fread(&lease, sizeof(lease), 1, fp)) {
+
+               for (i = 0; i < 6; i++) {
+                       printf("%02x", lease.chaddr[i]);
+                       if (i != 5) printf(":");
+               }
+               addr.s_addr = lease.yiaddr;
+               printf(" %-15s", inet_ntoa(addr));
+               expires = ntohl(lease.expires);
+               printf(" ");
+               if (mode == REMAINING) {
+                       if (!expires) printf("expired\n");
+                       else {
+                               if (expires > 60*60*24) {
+                                       printf("%ld days, ", expires / (60*60*24));
+                                       expires %= 60*60*24;
+                               }
+                               if (expires > 60*60) {
+                                       printf("%ld hours, ", expires / (60*60));
+                                       expires %= 60*60;
+                               }
+                               if (expires > 60) {
+                                       printf("%ld minutes, ", expires / 60);
+                                       expires %= 60;
+                               }
+                               printf("%ld seconds\n", expires);
+                       }
+               } else printf("%s", ctime(&expires));
+       }
+       fclose(fp);
+
+       return 0;
+}